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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7c35139498bd5461f81e25998b09dc033a3bee8ee7a1e8bb5456511a2b6512' 
  AND token = '0T74AbpxNcHC3zEBFYBR75/NQwacKC88/C2QXMl5ZiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}