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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95de7e9d7e5626d5db6896c1c970dfe4512d7f25d0364a98bd03d2201ec0499' 
  AND token = 'xpk4byua/6DO4AXVjOvQmh9fBLKeMMui2C+ZcVqVy8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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